簡易貫入試驗與土壤物理性質相關性之研究

Abstract

一般工程進行之前，必先對區域內的地層狀態詳加調查，而現在的地質調查多使用鑽探，並搭配標準貫入試驗。欲以少數鑽探地點的資料來代表大區域的地層狀態，有其盲點存在。本研究便採用簡易貫入試驗來推判山坡地坡面土層之強度與深度，其優點為經濟、簡單且方便，並可大範圍施行調查。經簡易貫入試驗的結果，配合土壤剖面，可知簡易貫入試驗阻抗值的變化與地層之變化，有著相當一致性的關係。故對於山地淺層土壤層次變化之調查，採行本法是可行且便利之方式。 經試驗可得知簡易貫入試驗之貫入阻抗(Nc值)之大小，與土壤物理和力學因子間(如乾土壤單位重、濕土壤單位重、孔隙率、凝聚力及內摩擦角等)之變化有密切的關係，並藉由現地貫入試驗並搭配室內土壤物理試驗之數據進行分析，建立其關係式。

It is necessary to have a complete strata characteristics survey before an engineering constructions is built. The interpretation of strata characteristics is usually based on few sampling points of geological boring and standard penetration test. However, it is not enough to represent the strata characteristics of the whole area based on few points. The purpose of this study is to evaluate the strata characteristics applying portable penetration test, due to its economic, easy, and convenient, on the large area of slope-lands. The result shown that portable penetration test was well corresponding to the soil profile. So it is a feasible and convenience way to estimate the gradation of the slope-lands. The results indicated that penetration resistance (Nc value) correlated with physics and dynamic factors such as dry bulk density, wet bulk density, void ratio, cohesion, and angle of friction. Finally, the field test data of portable penetration test was used to compare with the data of laboratory soil physics experiment.